Physics 2020 Past Questions | JAMB

Study the following Physics past questions and answers for JAMBWAEC  NECO and Post-JAMB. Get prepared with official past questions and answers for upcoming examinations.

31. Two divers G and H are at depths 20m and 40m, respectively below the water surface in a lake. The pressure on G is O1while the pressure on H is P2, If the atmospheric pressure is equivalent to 10m of water, then the value of P2/P1is

  • A. 0.50
  • B. 0.60
  • C. 1.67
  • D. 2.00

32. 0WlwT5pzEJEAAAAASUVORK5CYII=

The figure above represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40oo, then the value of W is 

  • A. 28.0N
  • B. 48.0N
  • C. 288.0N
  • D. 50.0N

33. r0YmrGMaSPAAAAAASUVORK5CYII=

In an experiment in which molten naphthalene is allowed to cool, the cooling curve i n the figure was obtained. The temperature 80oC is known as the 

  • A. cooling temperature
  • B. boiling point
  • C. melting point
  • D. vaporization point

34. In the figure, the value of R is 

  • A. 3Ω
  • B. 6Ω 
  • C. 4Ω 
  • D. 5Ω

35.  Which of the following instruments consumes the highest current?

I. Electric iron

II. Television set

III. Torch light

IV. Immersion heater

250v

220v

6v

110v

1kW

110W

30W

500W

 

  • A. I
  • B. II
  • C. III
  • D. IV

36. 

AS0nPLVq0skrAAAAAElFTkSuQmCC

In which of the following diagrams is the length of the tube equal to one wavelength? 

  • A. a
  • B. b
  • C. c
  • D. d

37. A hydrometer is an instrument for measuring the 

  • A. a depth of water of water in a vessel
  • B. relative density of a liquid by the method of flotation
  • C. relative density of a liquid by finding the apparent loss in weight
  • D. relative humidity of the air

38. A substance has half of 3 min. After 6 min, the count rate was observed to be 400. What was its count rate at zero time? 

  • A. 1600
  • B. 1200
  • C. 200
  • D. 2400
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